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Old 04-05-2004, 03:47 AM   #1
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Registered: Apr 2004
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how to delete a virus in bootsector?

hi everyone,

I've always had winxp on my pc and always had trouble with it, so I decided to install Mandrake 10, and everything runs smooth. However, when i boot my system, the boot selector thing says I've got a virus upon booting, and tells me I should use a bootable floppy. I can of course start my pc from a linux or windows boot disk, but what happens after that? I'm guessing it's not a linux virus but a windows virus, but my windows virus scan doesn't notice anything.

Does anyone know how to get rid of this virus and explain it in noob language? It might solve all my winxp problems as well.
Old 04-05-2004, 06:06 AM   #2
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Firstly you need to determine whether it is a boot sector virus. The BIOS detection apps on most motherboards report a change in software on the boot sector assuming that you haven't done it so it may not be a virus at all. Boot sector virii are not common anymore and are generally acquired via an infected floppy. Most users turn this function off.

This article will give you further info.
Old 04-05-2004, 10:35 AM   #3
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This is probably due to your linux installation.
When linux installs it's boot loader it usually places it in the MBR (Master Boot Record) which your BIOS monitors for changes.

If you are unsure if it is a boot sector virus you can reinstall the boot loader.
If you have lilo: /sbin/lilo
For grub I will have to redirect you to info grub for more information.

This will rewrite your MBR effectively wiping any boot sector virus. Your BIOS will complain about it, but you can turn off the virus warning, and then reactivate it later.
Old 05-15-2004, 12:46 PM   #4
Registered: Mar 2004
Location: mid-atlantic
Distribution: mandrake 9.1 rc2
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wiping MBR with DOS

the dos command "fdisk \mbr" at the command prompt will wipe the mbr; when you reboot to DOS (Windows 98SE and related Windows products) will reestablish the MBR automatically.

I read elsewhere on this site that the later versions of windows have similar commands that are named differently; search your help directory for information or search this site.


Last edited by robertn; 05-15-2004 at 12:48 PM.


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